<![CDATA[How to connect a NB-IOT unit to M5GoBottom (Core2)]]>For M5GO BOTTOM2 component and available port B what is the UART interface numbering for RX and TX signals?
Want to connect an NB-IOT unit via an UART cable. I've already allocated pin 13 and 14 for the GPS unit in the stack.

]]>https://community.m5stack.com/topic/3893/how-to-connect-a-nb-iot-unit-to-m5gobottom-core2RSS for NodeSat, 11 Apr 2026 20:59:30 GMTTue, 04 Jan 2022 18:26:49 GMT60<![CDATA[Reply to How to connect a NB-IOT unit to M5GoBottom (Core2) on Wed, 05 Jan 2022 17:31:22 GMT]]>Hello @falbriard

yes, port C (blue / GPIO13 / GPIO14) is blocked by the GPS module. However you can define a second serial connection in your code using port B (black / GPIO26 / GPIO36) and then connect the NB-IOT to port B.

And no, using two UART (serial) modules in parallel on the same port is not possible.

Thanks
Felix

]]>https://community.m5stack.com/post/16072https://community.m5stack.com/post/16072Wed, 05 Jan 2022 17:31:22 GMT<![CDATA[Reply to How to connect a NB-IOT unit to M5GoBottom (Core2) on Wed, 05 Jan 2022 12:10:18 GMT]]>The H5Go Bottom module implements "HY2.0-4P-PortC(blue)" and by default points to GPIO13 (RXD2) and GPIO14(TXD2). The same pins are already in use by the GPS module part of the M5 Core2 stack (currently set to TX=14, RX=13). Is there a solution to operate both modules in parallel, the NB-IOT (Uart) unit and GPS module?

]]>https://community.m5stack.com/post/16064https://community.m5stack.com/post/16064Wed, 05 Jan 2022 12:10:18 GMT<![CDATA[Reply to How to connect a NB-IOT unit to M5GoBottom (Core2) on Tue, 04 Jan 2022 19:05:15 GMT]]>Hello @falbriard

you'll find your answer looking at the published pin-mapping.

Thanks
Felix

]]>https://community.m5stack.com/post/16056https://community.m5stack.com/post/16056Tue, 04 Jan 2022 19:05:15 GMT